Another possibility is to post on Facebook that you're looking for an improv actor who would like to practice teaching on a group of non-actors to potentially teach actors for money.
There are so many ways to improv for free. Believe it or not, if you just strike up conversation with someone on line in front of you at the market, you could improv. Just say "yes and..." to everything they say, and you're improving. If you are really shy, make up a character who's not shy and start talking. Who cares what others think. Little do they know they're in a scene!
Have fun with it.
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